Finding the Fourth Proportional to 860,069.98, 1,290,109.10 and 261,036.34

Step by Step Solution

1. Step 1: Write the proportion equation
   860,069.98 : 1,290,109.10 = 261,036.34 : x
2. Step 2: Convert to fraction form
   860,069.98/1,290,109.10 = 261,036.34/x
3. Step 3: Cross multiply
   860,069.98x = 1,290,109.10 × 261,036.34
4. Step 4: Simplify right side
   860,069.98x = 336,765,357,664.69
5. Step 5: Solve for x
   x = 336,765,357,664.69/860,069.98
6. Step 6: Final answer
   x = 391,555.76